Machine for threading pipe-couplings.



.W. M. NEGKERMAN. MAGHINE FOR THREADING PIPE COUPLINGS. APPLICATION FILED NOV. 25, 1912.

WITNESSES:

IN V EN TOR.

' mam/WW A TTORNE Y.

COLUMBIA PLANUURAPH co., WASHINGTON. D. C:

Patented Feb. 3, 1914.

UNITED STATES PATENT UFFIQE.

WILLIAM M. NECKERMAN, OF YOUNGSTOWN, OHIO, ASSIGNOR TO THE YOUNGSTOWN SHEET AND TUBE COMPANY, OF YOUNGSTOWN, OHIO, A CORPORATION OF OHIO.

MACHINE FOR THREADING PIPE-COUPLINGS.

Specification of Letters Patent.

Patented Feb. 3,1914.

To all whom, it may concern:

Be it known that I, WILLIAM M. NECKER- MAN, a citizen of the United States, residing at Youngstown, in the county of Mahoning and State of Ohio, have invented new and useful Improvements in Machines for Threading Pipe-Couplings, of which the following is a specification.

My invention relates to improvements 1n machines for threading pipe-couplings.

It is the object of my invention to provide a machine by which pipe-couplings may be threaded so that the two sets of threads shall have their axes in perfect alinement. I provide two threading-heads, each provided with a set of reamers, arranged in perfect alinement, the heads entering the pipecoupling from opposite directions.

Referring to the accompanying drawing, Figure 1 is a vertical section of a portion of a machine provided with my invention.

. Fig. 2 is a side elevation of a pipe-coupling partly broken away, illustrating the work performed by the machine shown in Fig. 1. Fig. 3 is an end view of the pipe-coupling. Fig. 4 is a vertical section through the opposing ends of the heads, and Fig. 5 is a crosssection thereof.

In Fig. 2, I show a pipe-coupling A having the two internally threaded portions 1 and 2 and the two reamed-out portions 3 and 4: at its ends. It is essential that the threaded portions have their axes in alinement so that pipes connected by the pipe-- coupling shall be in alinement. The reamed-,

out portions should for the same reasons have their axes in perfect alinement. According to the usual practice the coupling blank is clamped in a chuck and then the threading-head is caused to enter the blank and thread and ream one end. Then the head is withdrawn from the blank, the blank is reversed end for end, and the head again caused to enter the blank and thread and ream the remaining end of the blank.

The coupling-blanks are not perfectly uniform in shape, so that, when they are gripped by a chuck, its axis is more or less out of alinement with the threading-head. The axis of the threaded portion made with the coupling-blank out of alinement would make a certain angle with the axis of the blank. The axis of the threaded portion made after the blank has been reversed would make an angle with the axis of the threaded portion in the other end of the coupling; at least, the two axes would not be in alinement.

In Fig. 1 I show the pipe-coupling A, threaded and reamed. It is held by the chuck 5 of any approved design. The ordinary chuck is satisfactory and need not be described. This chuck is supported on a horizontal plate or web 6 supported integrally or otherwise by the side frames of the machine. 7 indicates one of the said frames. The side frames are provided also with the two horizontal spindle supports 8 and 9, one above and the other below the chuck. These supports contain spindlebearings for the two spindles 10 and 11 which are set in perfect vertical alinement.

To the lower end of the spindle 10 I secure the head 12 which carries the threading dies 13 and the reaming cutters 1 1. These dies and cutters are not shown in detail, as dies and cutters of well-known construction may be used. The head 12 is not shown in detail as its details do not form any part of the present invention. However, I prefer the head, dies, and cutters shown in my application Serial Number 7 33,246, filed November 25, 1912. The lower end of the head 12 is provided with an extension 15 provided with a central cylindrical bore extending upwardly from its bottom, this bore being axially alined with the spindles 10 and 11.

To the upper end of the spindle 11 I attach the head 12 which is preferably like the head 12 except it is inverted and is provided with the central upward extension 16 which fits the bore on the extension 15.

A coupling blank having been gripped by the chuck 5 in the position occupied by the coupling A (Fig. 1), the upper spindle, which was raised by any suitable means, not shown, to permit the blank to be inserted into the chuck 5, is then lowered to about the position shown, or so that, when the lower spindle is raised by the lever 17 the extension 16 will enter the bore in the exten sion 15 somewhat in advance of the action of the threading dies on the blank. After the extension 16 enters the extension 15, which it should fit neatly, the spindles 10 and 11 and their heads 12 and 12 constitute a rigid structure. The lower spindle is caused to rotate, and cut the threads 2 in the coupling and ream out the portion 4, while the head 12 remains in the position shown. After the threading and reaming have been completed by the head 12*, it is lowered to about the position shown, and the upper spindle is moved down in a wellknown manner, not necessary to illustrate,

until the extension 15 is slid somewhat over the extension 16 and until the threading-dies 13 are ready to engage the blank. The spindle 10 is then caused to rotate by means well known and the threaded portion 1 is formed by the dies 13 and the reamed-out portion 3 is formed by the cutters 14. The upper spindle is retracted, and the finished coupling removed from the chuck.

It is seen that, as the spindles l0 and 11 are 111 axial alinement, as the heads 12 and 1:2 are in axial alinement with the spindles, and as the extensions are also in alinement with the spindles, the threads 1 and 2, and the reamed-out portions 3 and 4 have their axes in perfect alinement, no matter what the irregularities of the blanks may be.

I claim 1. In a machine for internally threading pipe-couplings, a chuck to grip the exterior of a coupling-blank, a pair of axially alined rotary, reciprocatory spindles, one at each side of the chuck, threading heads on the opposing ends of the spindles, threading dies on the heads, having their cutting portions projecting outwardly to thread the interior surface of the couplings, and means carried by the heads for holding each head in axial alinement with the spindles during the threading operation.

2. In a machine for threading pipe couplings, a chuck to grip the exterior of a coupling blank, a pair of axially alined potary reciprocatory spindles, one at each s de of the chuck, threading heads on the e ds of the spindles, and centering devices c ilgried by the heads and mutually cooperativ for holding the heads in axial alinement during the threading operation.

3. In a machine for threading pipe-couplings, a chuck to grip the exterior of a coupling-blank, a pair of axially alined rotary, reciprocatory spindles, one at each side of the chuck, threading heads on the opposing ends of the spindles, and telescopic projections on the opposing ends of the heads for holding the heads and spindles in axial alinement during the threading operation.

4:. In a machine for threading pipe couplings, a chuck to grip a pipe coupling, a rotary reciprocatory spindle at one side of the chuck, a threading head on the spindle adapted to enter one end of the coupling, a centering means in the remaining end of the coupling, and mutually cooperative means on the threading head and the centering means for holding the threading head in axial alinement with the centering means during the threading operation.

Signed at Youngstown, Ohio, this 21st day of November 1912.

l/VILLIAM M. NEGKERMAN. Witnesses JOHN J. CoNNoR, CHARLES WV. KEEFER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

